| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License |
| */ |
| |
| package benchmarks; |
| |
| import com.google.caliper.BeforeExperiment; |
| import com.google.caliper.Param; |
| import java.io.File; |
| import java.io.InputStream; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.util.Enumeration; |
| import java.util.Random; |
| import java.util.zip.ZipEntry; |
| import java.util.zip.ZipFile; |
| import java.util.zip.ZipOutputStream; |
| |
| |
| public class ZipFileReadBenchmark { |
| private File file; |
| @Param({"1024", "16384", "65536"}) int readBufferSize; |
| |
| @BeforeExperiment |
| protected void setUp() throws Exception { |
| System.setProperty("java.io.tmpdir", "/data/local/tmp"); |
| file = File.createTempFile(getClass().getName(), ".zip"); |
| writeEntries(new ZipOutputStream(new FileOutputStream(file)), 2, 1024*1024); |
| ZipFile zipFile = new ZipFile(file); |
| for (Enumeration<? extends ZipEntry> e = zipFile.entries(); e.hasMoreElements(); ) { |
| ZipEntry zipEntry = e.nextElement(); |
| } |
| zipFile.close(); |
| } |
| |
| /** |
| * Compresses the given number of files, each of the given size, into a .zip archive. |
| */ |
| protected void writeEntries(ZipOutputStream out, int entryCount, long entrySize) |
| throws IOException { |
| byte[] writeBuffer = new byte[8192]; |
| Random random = new Random(); |
| try { |
| for (int entry = 0; entry < entryCount; ++entry) { |
| ZipEntry ze = new ZipEntry(Integer.toHexString(entry)); |
| ze.setSize(entrySize); |
| out.putNextEntry(ze); |
| |
| for (long i = 0; i < entrySize; i += writeBuffer.length) { |
| random.nextBytes(writeBuffer); |
| int byteCount = (int) Math.min(writeBuffer.length, entrySize - i); |
| out.write(writeBuffer, 0, byteCount); |
| } |
| |
| out.closeEntry(); |
| } |
| } finally { |
| out.close(); |
| } |
| } |
| |
| public void timeZipFileRead(int reps) throws Exception { |
| byte readBuffer[] = new byte[readBufferSize]; |
| for (int i = 0; i < reps; ++i) { |
| ZipFile zipFile = new ZipFile(file); |
| for (Enumeration<? extends ZipEntry> e = zipFile.entries(); e.hasMoreElements(); ) { |
| ZipEntry zipEntry = e.nextElement(); |
| InputStream is = zipFile.getInputStream(zipEntry); |
| while (true) { |
| if (is.read(readBuffer, 0, readBuffer.length) < 0) { |
| break; |
| } |
| } |
| } |
| zipFile.close(); |
| } |
| } |
| } |